The $100 Optus Timeless Plan includes unlimited standard national voice calls, SMS, voicemail and 3GB of included data, making this plan ideal for very heavy users. Users should be aware international calls and premium calls aren’t included in the included value and these services will cost extra. Optus covers 97% of the Australian population with 3G dualband handset. Customers may need to pay a mobile repayment on 24-month contracts where a handset is included with the plan.